Very true, that's what I have witnessed guppy. I think the deer just don't want to "deal" with the cows. So they avoid coming close to them. Now they will come down opposite fence lines, etc.. from cows, but as far as walking right by them within a couple yards, they won't do it, period...
...and on that day when my strength is failing, the end draws near and my times has come, still my soul will sing Your praise unending, ten thousand years and then forevermore!